Patent US3702902A successfully refreshed from Google Patents.
US3702902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone dialing equipment
Assignee: ELECTROMITOR Inc
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Filing: 1970-07-21
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Granted: 1972-11-14
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Expires: 1990-07-21
Abstract
Abstract For use with a conventional telephone system, automatic dialing equipment which includes a master or central station and a remote, automatically triggered, dialing station. The remote station is triggered by an alarm device of no particular interest to the present invention such as one to indicate an intruder or a fire. The remote station, once triggered, electronically dials by forming the necessary make and break signals for the conventional telephone equipment found at the telephone exchange and the message is transferred through the exchange to the master station. The master station is adapted to respond to calls from several remote stations. The master station interrogates the remote station through coded tone pulses and receives a response indicating the identity of the remote station, the nature of the alarm, and other pertinent information which enables it to respond to the inquiry from the remote station and from a signal or output dictated by the nature of the interrogation.
Inventors
- 👤 John R Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:54
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
447 words
A remote automatic dialing station adapted to be connected to a central station by a telephone system including a telephone line, and which is responsive to data transferred over the telephone in the form of pulsed signals and which is further adapted to be responsive to a plurality of remote stations, and wherein the central station forms a tone to indicate completion of a telephone circuit between a remote station and the central station and the tone is transmitted over the telephone lines to the remote station, said remote station comprising: means for switching said remote station to an operable state in response to a predetermined event; sequencer control means in said remote station initiated in operation by said means for switching said remote station to an operable state for controlling in an ordered manner the dialing of a telephone number for temporarily connecting said remote station with a central station and for transferring information thereto; clock means; means for generating numbers as might be used by said sequencer control means in effecting a telephone line connection between said remote station and the central station; telephone dialing pulse means for dialing telephone numbers of the central station as formed by said number generating means in response to controlled operation of said sequence control means and at a rate determined by said clock means; means for transferring data from said remote station to the central station having a message content thereto for identification of said remote station, said means being operated in controlled sequence by said sequencer control means at a rate determined by said clock means; tone generator means adapted to be connected to the telephone lines for forming pulses controlled by said data transferring means; amplifier means connected to the telephone lines for amplifying tones received through the telephone lines from the central station; means connected with said tone amplifier means for examining incoming signals and determining whether or not a signal comes from the central station; audio oscillator means for forming a tone in said remote station, said audio oscillator means being switched on at a rate controlled by said data transferring means in a manner to encode data and said audio oscillator means comprising a portion of said tone generator means; transformer means for coupling signals into and out of the telephone lines connected with said remote station, said transformer means connected with said amplifier means and said audio oscillator means for transferring data therethrough; and, switching transistor means comprising a portion of said telephone dialing pulse means, said switching transistor means and said transformer means both being cooperatively connected with the telephone line for transferring data into and out of said telephone lines.
Claim 2
Dependent Claim
447 words
A remote automatic dialing station adapted to be connected to a central station by a telephone system including a telephone line, and which is responsive to data transferred over the telephone in the form of pulsed signals and which is further adapted to be responsive to a plurality of remote stations, and wherein the central station forms a tone to indicate completion of a telephone circuit between a remote station and the central station and the tone is transmitted over the telephone lines to the remote station, said remote station comprising: means for switching said remote station to an operable state in response to a predetermined event; sequencer control means in said remote station initiated in operation by said means for switching said remote station to an operable state for controlling in an ordered manner the dialing of a telephone number for temporarily connecting said remote station with a central station and for transferring information thereto; clock means; means for generating numbers as might be used by said sequencer control means in effecting a telephone line connection between said remote station and the central station; telephone dialing pulse means for dialing telephone numbers of the central station as formed by said number generating means in response to controlled operation of said sequence control means and at a rate determined by said clock means; means for transferring data from said remote station to the central station having a message content thereto for identification of said remote station, said means being operated in controlled sequence by said sequencer control means at a rate determined by said clock means; tone generator means adapted to be connected to the telephone lines for forming pulses controlled by said data transferring means; amplifier means connected to the telephone lines for amplifying tones received through the telephone lines from the central station; means connected with said tone amplifier means for examining incoming signals and determining whether or not a signal comes from the central station; audio oscillator means for forming a tone in said remote station, said audio oscillator means being switched on at a rate controlled by said data transferring means in a manner to encode data and said audio oscillator means comprising a portion of said tone generator means; transformer means for coupling signals into and out of the telephone lines connected with said remote station, said transformer means connected with said amplifier means and said audio oscillator means for transferring data therethrough; and, switching transistor means comprising a portion of said telephone dialing pulse means, said switching transistor means and said transformer means both being cooperatively connected with the telephone line for transferring data into and out of said telephone lines.
Claim 3
Dependent Claim
47 words
The invention of claim 1 wherein said means for generating numbers is connected with said clock means and includes a ten state register and has an output for each of the 10 states, and each of said outputs is adapted to be connected with said sequencer means.
Claim 4
Dependent Claim
74 words
The invention of claim 1 wherein said sequencer control means includes a first dwell state, a state for each of the numbers required for dialing of the telephone number for temporarily connecting said remote station with the central station, a state at the conclusion of dialing, a state permitting transfer of data by said data transferring means, and a state causing disconnection of said remote station from the telephone line to the central station.
Claim 5
Dependent Claim
100 words
The invention of claim 1 for connection with a pair of telephone lines including: a. switching transistor means connected between the telephone lines, said switching transistor means having at least two operative conditions, one of which simulates the make, and the other of which simulates the break of conventional telephone dialing apparatus wherein the make is characterized by having a line-to-line impedence of approximately 1,000 ohms, and the break is characterized by having an impedence exceeding approximately 10,000 ohms; and, b. said tone generating means being connected across said telephone lines for transferring pulses formed thereby into the telephone lines.
Claim 6
Dependent Claim
87 words
The invention of claim 1 wherein said telephone dialing pulse means incorporates a switching transistor connected between the telephone lines, circuit means connected to said transistor means for controllably switching said transistor means from a saturated state to a cut-off state; series impedence means cooperative with said transistor means for providing a predetermined impedence within a given range line-to-line of the telephone lines connected thereto; and, means for connecting tones into the telephone line which are within the audio range as generated by said tone generator means.
Claim 7
Dependent Claim
65 words
The invention of claim 1 including means for generating an identification symbol indicative of the particular remote station; means for uniquely identifying the manner in which said means for switching said remote station to an operable state is identified; said two foregoing means forming the data for said data transferring means; and, said data being embodied in an alphanumeric code by said tone generator means.
Claim 8
Dependent Claim
59 words
The circuit of claim 1 further including means connected to said means for examining incoming signals responsive to the incoming signals, said means causing said telephone dialing pulse means to dial telephone numbers for the central station a second time in the event that said last named means determines that the signal did not come from the central station.
Claim 9
Dependent Claim
28 words
The circuit of claim 1 wherein said means for examining incoming signals includes means for detecting an incoming signal of a predetermined duration within a predetermined frequency range.
Claim 10
Dependent Claim
128 words
The circuit of claim 1 wherein said means for examining incoming signals includes a tone filter means which is tuned to form an output signal when the central station transmits a signal through the telephone lines dependent on the frequency thereof, and further including a circuit means connected to said tone filter means and responsive to the occurrence of a predetermined tone from the central station, said means being connected to said sequencer control means in a manner such that said sequencer control means re-dials the telephone number of the central station on the absence of a signal from said tone filter means, and said sequencer control means further transfers data by operation of said tone generator means on receipt of a signal from said tone filter means.
References Cited (Backward Citations)
US3588362A
Cited
US3582555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |